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Full text of "The manufacture and properties of iron and steel"

METALLURGY OP IRON AND STEEL.
ations in the details of plate-rolling.—It has been already stated that it is the practice at The Pennsylvania Steel Works to roll a preliminary test-bar from each open-hearth heat for physical testing, and that the ultimate strength of this bar corresponds closely with that of angles rolled from the same charge. In the case of plates, on the contrary, there is often a considerable variation, and Table XTV-EL investigates the effect of such differences upon the physical qualities.
TABLE XIV-L.
Changes in the Physical Properties of Steel by Variations in the Details of Plate-Boiling; Classified According to Strength of Finished Plate.
Ihiarth steel 1 Basic open-nearcn steel, f -| neartn steel. | | limits Of nit. streneth of 1	g g finished plate; pounds g^g per square inch.	Thickness of plate in inches.	g g Number of heats tested.	Increase in ultimate strength from preliminary test to plate ; pounds per square	Ultimate strength ; pounds per square inch.			Elastic limit of plate ; pounds per square inch.	Elastic ratio of plate ; per cent.	Elongation of plate in 8 inches ; per cent.	Reduction of area of plate ; per cent.
					Finished plate. .	Preliminary test bar.	^Ifit				
		A i		more than 4000 less    than 4000	66971 56652	51963 54680	5008 1972	43106 41845	75.6 73.0	26.66 27.85	C7.8 55.2
			42 49 7 6	more than 8000 less    than 8000	66370 65958	52161 54441	4209 1517	40387 89759	71.6 71.0	28.28 28.66	58.5 58.2
		i		more than 1700 less    than 1700	65963 53981	58891 58218	2572 768	87613 84802	67.2 64.5	80.27 31.43	58.6 59.6
			4	more than 1100 less    than 1100	56633 55292	54076 54843	2557 449	36866 86150	64.2 65.4	27.91 28.50	54.7 53.7
	58000 to 64000	1	89 88	more than 4000 less    than. 4000	60130 59344	54284 56401	5896 2943	44572 44054	74.1 74.2	26.68 26.92	58.7 56.2
			15 15	more than 8000 less    than 8000	59750 58920	58676 56969	6074 1951	40928 40855	68.5 69.8	27.87 28.07	67.6 58.7
	56000 to 64000	i	6 6	more than 2550 less    than 2550	62841 61080	59151 60557	8C90 528	43983 41200	69.9 67.4	25.92 25.04	50.5 52.0
		A i	9 11 17 16	more than 1400 less    than 1400	61833 59527	59647 59439	2186 88	42512 •40280	68.7 67.6	25.28 24.45	54.9 53.8
				more than 1700 less    than 1700	61241 60331	59442 60442	1799	40110 89800	65.5 66.0	24.88 24.43	50.7 48.6
It is assumed that the preliminary test-piece is the standard, and whatever difference from this is shown in the plate is due to the conditions of rolling. On this basis it is possible to compare those plates which show a great with those which show a less, variation